The Mansion of Terror

Zorori and the boars meet a group of monsters trying to be scary. They go to a nearby town to scare people, but are welcomed as entertainers. Zorori tries to show the monsters how to be scary by harnessing their abilities, but it all backfires. He builds a giant robot to scare the town with, but it goes haywire. They succeed in being thrown out of town and inciting fear. Based on book 2.